Genetics
The Mockernut is a 64 chromosome species and therefore very rarely if ever crosses with 32 chromosome species such as Pecan or Shellbark hickory. There is no published information concerning population or other genetic studies of this species.
Hickories are noted for their variability, and many natural hybrids are known among North American species. Hickories usually can be intercrossed successfully within the genus. Geneticists recognize that mockernut hickory hybridizes naturally with: C. illinoensis (Carya x schneckii Sarg.) and C. ovata (Carya x collina Laughlin).
Read more about this topic: Carya Tomentosa